mac: Let task manager use IDR_PRODUCT_LOGO_16 instead of NSApplicationIcon.

ui/gfx/image/image_skia_util_mac.mm

Index: ui/gfx/image/image_skia_util_mac.mm
diff --git a/ui/gfx/image/image_skia_util_mac.mm b/ui/gfx/image/image_skia_util_mac.mm
index 281badc74233fd4c0a4928451fe7a3878ec3630c..26c067331a719922d855d1631b302186e020a3f9 100644
--- a/ui/gfx/image/image_skia_util_mac.mm
+++ b/ui/gfx/image/image_skia_util_mac.mm
@@ -78,12 +78,6 @@ gfx::ImageSkia ImageSkiaFromResizedNSImage(NSImage* image,
   return image_skia;
 }
 
-gfx::ImageSkia ApplicationIconAtSize(int desired_size) {
-  NSImage* image = [NSImage imageNamed:@"NSApplicationIcon"];
-  return ImageSkiaFromResizedNSImage(image,
-                                     NSMakeSize(desired_size, desired_size));
-}
-
 NSImage* NSImageFromImageSkia(const gfx::ImageSkia& image_skia) {
   if (image_skia.isNull())
     return nil;